<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="https://cdn.jsdelivr.net/npm/vue@2.6.10/dist/vue.js"></script>
</head>

<body>
    <div id="app">
        <button @click="handler">change</button>
        <ul>
            <li v-for="value, key of person">{{key}}----{{value}}</li>
        </ul>
    </div>
    <script>
        Vue.config.productionTip = false;
        
        const vm = new Vue({
            el: "#app",
            data() {
                return {
                    person: {
                        name: 'zhangsan',
                        age: 18
                    }
                }
            },
            methods: {
                handler() {
                    // this.person.sex = 'nan';
                    // delete this.person.age;
                    // this.$set(this.person, 'sex', 'nan');
                    // Vue.delete(this.person, 'age')
                }
            },
        })
</script>
</body>

</html>